[BUG] Claude Code v2.1.27 gets stuck on the first message, with very high memory usage.

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude Code v2.1.27 gets stuck on the first message, with very high memory usage.

What Should Happen?

Claude Code v2.1.27 gets stuck on the first message, with very high memory usage.

Error Messages/Logs

Steps to Reproduce

Claude Code v2.1.27 gets stuck on the first message, with very high memory usage.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.27

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_